A brief discussion on the new features of CSS3: multi-column layout module

CSS3 has added a new multi-column layout module (Multi-column Layout Module), which is mainly used in multi-column layout of text.

Multi-column can be divided into:

①Number of columns and column width: column-count , column-width, columns

column-count: The value is a positive integer without a unit, indicating the number of columns for Multi-column classification. The default is auto (number of columns Determined according to column-width and other parameters). IE does not support this attribute. Under Firefox and Webkit, you need to add the prefixes -moz and -webkit.

column-width: Indicates the column width of Multi-column. Its unit is px or em, but it cannot be a negative number. The default is auto (the number of columns is determined by other parameters such as column-count). Defined, but column-count cannot be auto at this time). IE does not support this attribute, but Opera11+ supports it. Under Firefox and Webkit, the prefixes -moz and -webkit need to be added.

columns: Combine the column-width and column-count attributes together. This abbreviation mode is only supported under Webkit and Opera, not Firefox.

If column-width and column-gap are set at the same time, the actual column width will be adjusted according to column-gap and may not be equal to the set column-width value.

When the set column width is larger than the width of the element container, the element content will not be laid out according to the column width and break the container. It will only reduce the column width to the width of the container. equal.

In order for the columns to adapt to various screen sizes, it is best to set an exact column width or number of columns, and specify related attributes accordingly, such as width, column-gap, column of the element -rule-width, etc. If column-gap, column-rule-width uses default values, it is best to clearly write the values ​​of column-gap, column-width and column-count in multi-column designs.

②Column spacing and column style: column-gap, column-rule-color, column -rule-style, column-rule-width, column-rule

In cross-column layout, column-gap is equivalent to the blank space between two columns, similar to margin; The column-rule is equivalent to a dividing line, similar to a border. column-gap and olumn-rule have heights, which are the same height as the columns. The biggest difference is that column-gap does not have any style and occupies a certain space between columns, while column-rule has a certain style. Similar to borders, there are styles.

column-gap unit is px or em, but cannot be a negative number. The default value is normal (1em). IE does not support this attribute, but Opera11+ supports it. Under Firefox and Webkit, the prefixes -moz and -webkit need to be added.

Although column-gap can be used to change the distance between adjacent columns, when column-width is set for multiple column elements at the same time, the sum of column-gap and column-width When it is larger than the total width of multiple columns of elements, the columns will be broken and displayed in the first column. At this time, the column width will automatically adjust to the total width of the elements.

column-rule also has properties similar to border: width column-rule-width (default value is medium), style column-rule-style (default value is none), color column -rule-color, the difference is that border occupies a certain spatial position, while column-rule does not occupy any spatial position. Increasing column-rule-width will not affect the layout of the column, but will only expand it to both sides of the element. to the edge of the element.

##③Column breaks: break-before, break-after, break-inside

Currently there are very few browsers supported, so we won’t introduce them yet.

##④

Fill column: column-fill

Currently there are very few browsers supported, so we will not introduce them yet.

##⑤

Spanning columns: column-span

column-span is mainly used to define how many columns a sub-element in a column element can span. Sometimes it is necessary for a certain content or title not to be divided into any columns but to span all columns. In this case, the column-span attribute is needed. The default value is none, which means it does not span any column; all means it spans all columns. The only browsers currently supported are Safari, Chrome, and Opera11+. Under Webkit, the prefix -webkit is required.

.multiColumns {
	-moz-column-count: 3;
	-webkit-column-count: 3;
	column-count: 3;
	-moz-column-gap: 30px;
	-webkit-column-gap: 30px;
	column-gap: 30px;
}
.multiColumns h1 {
	background: red;
	-webkit-column-span: all;
	column-span: all;
}

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